Process for producing beta-gamma-dimethylerythrene.



UNITED STATES PATENT OFFICE.

rnrrz HOFMANN, KoNI-An nsminflcx,

AND KURT MEISENBURG, OF ELBERFELD, GER

MANY, ASSIGNORS TO FARBENFABRIKEN VORM. ERIE-DR. BAYER & 00., 0F ELBEE-FEED, GERMANY, A COBIOBATION OF GERMANY.

PROCESS FOR PRODUCING BETA-GAMMA-DIMETHYLERYTHRENE.

Patented Oct. 21, 1913.

No Drawing. Original application filed May 9, 1912, Serial No. 696,160.Divided and this application filed August 15, 1912. Serial No. 715,252.

'beta-gamma-dimethylerythrene and which consists in heating inacone witha small quantity of a sulfonic acid. The use of a small amount of acid(less than the amount of pinacone reacted upon) results in much largeryields of the hydrocarbon than has been obtained by processes heretoforeknown. With a fraction of a per cent. only of the acid unusually largeyields are obtained.

The process proceeds according to the following equation:

In order to illustrate the new process more fully the following exampleis given, the parts being by weight :-1000 parts of pinacone are heatedwith 1 part of naphthalene-'i.5 disulfonic acid to 13014=0 C.Dimethylerythrene and water distil over hesides pinacone hydrate andsmall quantities of pinacolin. The beta gamma dimethylerythrene isolatedfrom the mixture boils at 68 69 C.

Instead of the above mentioned sulfonic acid other sulfonic acids, suchas monoor napithalene-trisulfonic acids, etc., can be use 1 We claim2- 1. The process of producing an erythrene hydrocarbon which comprisesdistilling a pinacone with an amount of sulfonic acid substantially lessthan the amount of pinacone reacted upon.

2. The process of producing an erythrene hydrocarbon which comprisesdistilling a pinacone with a fraction of a per cent. of a sulfonic acid.

3. The process of producing an or threne hydrocarbon which comprisesdisti ling a pinacone with a fraction of a per cent. of anaphthalene-sulfonic acid.

4. The process of producing an erythrene hydrocarbon which comprisesdistilling a pinacone with a fraction of a per cent. ofnaphthalene-1.5-disulfonic acid.

5. The process of producing an erythrene hydrocarbon which comprisesdistilling a pinacone with about one tenth of one per cent. of asulfonic acid.

6. The process of producing an erythrene hydrocarbon which comprisesdistilling a pinacone with about one tenth of one per cent. ofnaphthalene sulfonic acid.

7. The process of producing an erythrene hydrocarbon which comprisesdistilling a pinacone with about one tenth of one per cent. of anaphthalene-1.5-disulfonic acid.

8. The process of producing beta-gammadimethylerythrene, which processcomprises first distilling pinacone with a fraction of a per cent. of asulfonic acid and then separating the beta-gamma-dimethylerythrene,substantially as described.

9. The process of producing beta-gamma dimethylerythrene, firstdistilling pinacone with a fraction of a per cent. ofnaphthalene-1.5-disulfonic acid and then separating thebeta-gamma-dimethylerythrene, substantially as described.

10. The process of producing beta-gamma-dimethylerythrene which processcomprises distilling pinacone with about one tenth of one per cent. of asulfonic acid and which process comprises I described.

then separating the beta-gamma-dimethyL In testimony whereof we havehereunto 10 erythrene, substantially as described. set our hands in thepresence of two sub- 11. The process of producing beta-gamscribingwitnesses. ma-dimethylerythrene which recess com- FRITZ HOFMANN [L.s.]prises distilling pinacone wit about one KONRAD DELBRUCK. [L.s.] tenthof one per cent. of a naphthalene-1.5- KURT MEISENBURG. [L. s.]disulfonic acid and then separating the beta- Witnesses:gamma-dimethylerythrene, substantially as HELEN NUFER,

ALBERT NUFER.

